Hexahydrobenzoguanamine oil modified alkyd coating compositions



2,859,188 Patented Nov. 4, 19 58 2,859,188. l i HEXAHYDROBENZOGUANAMINE OIL MODIFIED 'ALKYD COATING COMPOSITIONS Rudolph L. Heider, Springfield, Mass, and. Harry M. I Walker, Dickinson, Tex., assignors to Monsanto Chemical Company, St. Louis, Mo., a corporation of Delaware . No Drawing. Application November 26 ,1956

' Serial No. 624,212

scams. c1. zen- 21 This invention relates to surface coating compositions. More particularly, the invention relates to coating compositions comprising alkyd resins modified with etherified hexahydrobenzo-guanamine-aldehyde resins.

Melamine resins have been used to modify the characteristics of alkyd resin coating compositions and have been successful in improving the rate of'cure, color retention, chemical resistance, and exterior durability of such compositions. 'However, the known etherified melamine-formaldehyde resins offer the choice of high cure response with limited alkyd compatibility or lower cure response with wider alkyd compatibility and decreased detergent resistance. The former group, more important commercially, decrease the stability of high acid number alkyds, impair the gloss of alkyd resin coatings, and cause a tendency to brittleness of the modified films.

. One object of thisinvention is to provide new surface coating compositions.

Another object is to provide ing compositions. v

Another object is to, provide coating compositions comprising alkyd resinsmodified with etherified hexahydrobenzoguanamine-aldehyde resins. V g

Another object is to provide a substituted triazine based surface coatingresin of superior gloss, cure, and determodified alkyd resin coatequivalent to melamine. V

A further object is to provide resins having increased compatibility with alkyd resins of long oil lengths.

These and other objects are attained by incorporating gent resistance which also possesses exterior durability alkyd resin coating compositions.

. The following examples are given to illustrate them- 1 iset Example 1 the desired solids content. The product is a clear, colorless solution of butylated-hexahydrobenzoguanamineformaldehyde resin in butanol. various surfaces and cured to form hard, brittle films having a high gloss.

Example II The butylated hexahyd'robenzoguanamine formaldeenamel having the following formulation:

etherified hexahydrobenzoguanamine-aldehyde resins into.

trated under a vacuum of about 100 mm. of mercury to- It can be applied to hyde resin of Example I is used in making a pigmented P n by weight Alkyd resin :20 Resin of Example I (by solids)"; .10 Titanium dioxide 25 Xylol i in p 40 Butanol 5 The alkyd resin is a coconut oil-modified glyceryl phthalate resin containing about 33% by weight of combined fattyacids.

5 minutes. The resulting film has a Sward hardness of 62 and is also characterized by good properties. of

gloss, chemical resistance, exterior durability, and color The alkyd resin is a soybean oil-modified glyceryl phthalateresin containing about 41% by-weight of combined fatty acids. The enamel is sprayed onto a steel panel and baked at temperatures of 180450 F. for:

60-5 minutes to produce a hard film having high gloss and good properties of color retention and detergent resistance. i V

' j Example IV unpigtnentedjclear baking prepared ac:

cording to the followingformula: a

Parts by weight Alkyd resin I V V 27.00 Resin of Example I (by solids) 3.00 Hydrocarbon solvent 1 50.00 Butanol 5.00 Cobalt naphthena 0.06

The alkyd resin is a soybean oil-modified glyceryl phthalate resin containing about 62% by weight of com bined fatty acids. mercial mixture of petroleum aliphatic hydrocarbons. The varnish is sprayed onto "a steel panel and baked at about l80450 F. for 60-5 minutes to produce a hard film having high" gloss and good properties of detergent resistance and resistance to yellowing. 3 i p r The etherified hexahydrobenzogtianamine-aldehyde resins which are'iused to modify alkyd resins in making 'the improved compositions of this invention are heat re actionfproducts of from 3 to 6 molar proportions of a saturated monocarbonyl aldehyde containing 14 carbon monohydric alcohol containing 1- 6 carbon atoms, and

1 molar proportion of he'xahydrobenzoguanaminer These resins may be prepared by reacting the aldehyde and the hexahydrobenzoguanamine under alkaline conditions and then reacting the product with the alcohol under acid conditions. The resins and processes for preparing them Example V A mixture of 1 mol of hexahydrobenzoguanamine, 5.3 I

mols of 91% aqueous para-formaldehyde, 2 mols of water, and 5 mols of methanol is refluxed for 30 minutes The enamel is sprayed onto a steel panel and baked at temperatures of l450 F. for

The hydrocarbon solvent is -a -corn- V lorless solutien of-methylated-hexahydrotiefizgiianamine-formaldehyde-resin-in-methanoh r H u The-coating-compositions of-this-inventiomare organic solvent solutions of blends-of oil-modified alkyd resins resins. ..-The amountlof fiherified-resin may vary. from 1 i ..r1..l,.l:.' .I; 11;; ,J,

lie alkyd resins are polyester resins obtained by re-1' acting polyhydric alcqhols such as glycols, glycerols, sorbitol, pentaerythritolfetc, with polybasic acids such as phth'alic acid, isoph'thalic acidi nia'leic acid, adipic acid, azelaic acid, sebacic acid, etc.,-which resins may be -modifid with minor amounts of saturated and unsaturated --Of' greatimportanceis the combination of superiorexterior durability with high gloss, heretofore relativelyun attainable. These coatings also possess superiorc olor retention, resistance to yellowing, chemical resistancef and high cure response.

It is obvious that many variations maybe made in fthe products and processes set forth above without departing from the spirit and scope of this invention. 7 V

What is claimed is: 1. A coating composition comprising-arrorganic'solution of from'50 to 90% byweightof"an'foil modified l alkyd resin and from 10 to 50% by weight of an'therified hexahydrobenzoguanamine-aldehyderesin; 'saidethermonobasieacids; saturated and unsaturated monohydlfic 316611018;etQ; "The"0i1-m6difid alkyd resins ar p'olyester resins -whieh -havebeen--modified-with dryingand semidryingoils such as coconut oil,- -castor "oil, soybean 'oil', lins'edoil; --tung oil, and-the acids -derivedetherefr0m and the partial glycerides-of-the--acids. --Minor propor- :7

tions of npn-drying oils may be used as internal plasf tic izers 'I heetherified resins are particularly advantageous for use combination with oil-modified alkyd resins containing 30-70%, and preferably 30-45%; by;

weight otcombinedoil acids.

The etherified resins derived from melamine or: urea which may be blended with the alkyd resins a re;eth'ersof condensation products of melamine or urea or mixtures thereof with aldehydes. The resins may be further modified :Hy -interreaction with1 such .materialsas toluene sulfonamides, phenyl acetoguanamine, etc. For best'res'ults(the heiahydrobenzoguanamine ether resin should constitute-atleast"50 weightfpercent of'the two additives blendedwiththe-alkyd'resin.;

'Ihe mixtures'of alkyd resinsand'etherified hexahydro-v benioguanamine-aldehyde resin "are soluble organic solvents su'ch as hydrocarbons, alcoholsQether's; keton'e's;

esters-,-=and-mixture's thereof; 'e. g.,"xylol-buta nol and aliphatic hydrocarbon-butanol mixtures. Conventional pigmentsand-driers such as-manganese, lead, and't'cobalt driers-ruayj be incorporated into the compositions;- The, 0

coatingwompositions may have a resinous solids content of;'208( 1%.

var ious surfajcessuchias wood, papergrhtahteitiles,

etc. may be coated withthe compositions: Of'flliS inven" tion. -Applications of the coatingsr may be accomplished by 'conventionalm'ethods; e. g, brushing; spraying, :roll

coating, tumbleroatingfetc; The coatings are-cured by heating at tcmperaturesof 180 450 for60- 5 -min inmanyproperties to the alkyd resin coating'composia tionsiWhich-aremodified 'withother aminoplast'zresins.

ified hexahydrobenzoguanamine=aldehyde resin being .I

monoalkanol containing 1-6 carbon atoms under acid conditions. 7 I

2. A coating composition-as in claim'l whereimthe; monoalkanol is formaldehyde. V

3. A coating compositionas m jclaim lxwhereimtlie monohydric alkanol is butanol. r v 4. A-coating compositionas fin-claim 1 wherein' the oil-modified alkyd-resin contains 30-40% by weight "of 1 combined fatty acids. a V v V I T 5. A coating composition as-in claim 4-wherein the monoalkanal is formaldehyde 'and'th'e monohydric al= kanol-is butanol. V v 6. A coating cornpisitionwas= in -claim'5 wherein the organic solvn -a r'niirtiire -of 'xylol'and *bufanol.

7. A coatin'g 'composition"'as-in 5 'whe'rem' the mixture of aliphatic hydrocarbons f organic solvent is a and butanol. r u l 8. A coating composition comprisingdrblend of 1 oil-modified alkyd resin and 10 rby weight" a mixture of. an etherified h'exahydrobenzo'guanarn ue' a monoalkanal is formaldehyde and the .etherify'ing' agiit is butanol.

i References Cite'd'inthefil'e of this 'pa'tnt- UNITED STATFS PATENTS J 2,197,357 I Widmer et.al..- 'Apr. '16, ;1940 2,294,590 r P1942 2,649,423 I I 1 1953, Lindenfelser et a1. ;."Septr4,i'1956 

1. A COATING COMPOSITION COMPRISING AN ORGANIC SOLUTION OF FROM 50 TO 90% BY WEIGHT OF AN OIL-MODIFIED ALKYD RESIN AND FROM 10 TO 50% BY WEIGHT OF AN ETHERIFIED HEXAHYDROBENZOGUANAMINE-ALDEHYDE RESIN, SAID ETHER. IFIED HEXAHYDROBENZOGUANAINE-ALDEHYDE RESIN BEING PREPARED BY (1) THE ALKALINE CONDENSATION OF FROM 3 TO 6 MOLAR PROPORTINS OF A MONOALKANAL CONTAINING 1-4 CARBON ATOMS WITH 1 MOLAR PROPORTION OF HEXAHYDROBENZOGUANAMINE AND (2) SUBSEQUENTLY REACTING THE CONDENSATION PRODUCT WITH FROM 3 TO 10 MOLAR PROPORTIONS OF A MONOALKANOL CONTAINING 1-6 CARBON ATOMS UNDER ACID CONDITIONS. 